The RCA caps protect RCA from oxidation and signal interference, such as RF, RFI, EMI emissions. | They can also prevent dust & dirt from building up in unused open RCA connectors. | The RCA caps are made of brass and rhodium plated to ensure ultra shield and protection shield against,and of high quality. The middle pin can be removed. | It is designed for HIFI. | Package including 8 pieces.Warranty: 360 days